I am on an ongoing search for a travel-friendly substitute for a Rapidograph pen. Not that anything bad ever happened to me, but every time I read a horror story about a Rapidograph exploding during the flight or staring to leak dues to a change of temperature in the car, I start to think that carrying one around is not a good idea. The problem is that each and every alternative is not black enough.
My latest find is a Tombow ABT one with a tip shaped like a brush. This, indeed, is very convenient, but the problem remains – it’s dark gray at best and requires more than one layer if I want black. So the quest for a truly dark pen that is not a Rapidograph continues.